Abstract: A communication method includes: receiving, by a terminal device, first information from a network device, wherein the first information comprises N information blocks, a jth information block in the N information blocks comprises a first field, the first field indicates at least one of a band or a carrier after switching of the terminal device, the jth information block is associated with at least one of a band or a carrier before the switching of the terminal device, and N is a positive integer; and transmitting, by the terminal device based on the first information, uplink data in the at least one of the band or the carrier after the switching.

Abstract: An example communication method includes determining, by a terminal device, M second switching delays, wherein a jth second switching delay is a delay for switching by the terminal device between a first frequency band group and a second frequency band group, the jth second switching delay is one of the M second switching delays, the first frequency band group and the second frequency band group each comprise at least one frequency band, and M is a positive integer. The terminal device can send third information to a network device, wherein the third information comprises the jth second switching delay.

Abstract: A method includes receiving, by a terminal device, timing information; determining, by the terminal device, a first uplink sending moment based on the timing information and a synchronization signal; and sending, by the terminal device, an uplink signal to an access network device at the first uplink sending moment, wherein both the timing information and the synchronization signal are from a network device, and the access network device does not support downlink transmission.

Abstract: This application provides a downlink signal receiving method, a terminal, and a source base station. The method includes: sending a first capability indication to a source base station, wherein the first capability indication indicates that the terminal has an intra-frequency receiving capability; in response to the first capability indication, receiving a first message from the source base station, wherein the first message comprises a first indication, and the first indication indicates the terminal to receive, during a handover process, a downlink signal from the source base station and a downlink signal from a target base station, wherein the downlink signal from the source base station and the downlink signal from the target base station have a same frequency; and receiving during the handover process, the downlink signal from the source base station and the downlink signal from the target base station based on the first indication.

Abstract: Example uplink signal sending methods and apparatus are described. One example method includes determining, by a terminal, a symbol that needs to be punctured, and sending the uplink signal by the terminal based on the symbol that needs to be punctured. Further, the terminal may notify the source cell and/or the target cell of the symbol that needs to be punctured, so that the source cell or the target cell improves, according to a notification indication, decoding on the uplink signal sent by the terminal.

Abstract: This application provides a power control method and an apparatus. The method includes: A terminal device determines a second power from at least one power based on a first power of a first reference signal. There is a correspondence between the at least one power and at least one parameter. The terminal device sends the first reference signal based on the second power. This application provides the power control method and the apparatus. The terminal device sends an uplink reference signal to enable UE to obtain more accurate path loss information. In this way, accuracy of a calculated path loss value is improved, and therefore, power control is better implemented.

Abstract: In a communication method, a terminal may send first information to a network device on a first carrier, to trigger measurement on at least one second carrier or at least one beam of at least one second carrier. Subsequently, the terminal may send or receive a reference signal on the at least one second carrier or the at least one beam.

Abstract: A communication method and apparatus are provided. The method includes: receiving configuration information from a network device, where the configuration information indicates an occasion and/or a period for sending a measurement signal on a second uplink carrier; obtaining signal quality or signal strength on a downlink carrier associated with a first uplink carrier, or signal quality or signal strength on a downlink resource on a first uplink carrier; and when a first condition is met, sending the measurement signal on the second uplink carrier by occupying the occasion and/or the period; or when a first condition is not met, determining not to send the measurement signal on the second uplink carrier by occupying the occasion and/or the period.

Abstract: A communication method and an apparatus are provided. The method includes: A terminal device receives first information from a network device, where the first information is for indicating an antenna port configuration used by an uplink carrier; and the terminal device determines statuses of L transmitters in the terminal device based on the antenna port configuration, where L is an integer greater than 0.

Abstract: A communication method and a communication apparatus are provided. In the communication method provided in embodiments of this application, a first device determines a first link resource, where the first link resource is used for sending information to a first terminal by the first device; and the first device determines a second link resource, where the second link resource is used, by the first device, for receiving information sent by a second terminal, where the first link resource has a same frequency resource as the second link resource.

Abstract: A method and an apparatus for determining transmit power, where a first network device obtains first information corresponding to a first carrier, where the first information includes at least one of a path loss, a range of the path loss, signal strength, a range of the signal strength, a channel quality state, or a range of the channel quality state; and where the first network device sends the first information to a terminal device. The terminal device determines uplink transmit power on the first carrier based on the first information. In this way, the uplink transmit power on the first carrier is accurately controlled, communication reliability is improved, and power consumption of the terminal device is reduced.

Abstract: A method and device for estimating the time of arrival (ToA) of a radio signal are proposed. The radio signal comprises M subsignals carried on M subcarriers, where M is an integer ?2. The number of propagation paths and the time of arrival associated with a first path are estimated. The technique can improve ToA estimation accuracy, especially in a multipath fading channel, and reduce the need for channel information.

Abstract: This application relates to a communication method and device. The communication method includes: determining, by a terminal device, whether the terminal device supports sending and/or receiving of a signal other than a first reference signal in a measurement process; and receiving, by the terminal device, only the first reference signal within a first time domain range when the terminal device does not support sending and/or receiving of the signal other than the first reference signal in the measurement process, where the first time domain range includes a first time domain symbol and a second time domain symbol, the first time domain symbol is a time domain symbol configured by a network device, and the second time domain symbol includes N time domain symbols before the first time domain symbol and/or N time domain symbols after the first time domain symbol.

Abstract: This application provides a downlink signal receiving method, a terminal, and a source base station. The method includes: A terminal may receive downlink signals from a source base station and a target base station in a handover process. When receiving no downlink signal from the target base station, the terminal receives the downlink signal only from the source base station. In addition, after handover is completed, the terminal receives the downlink signal only from the target base station, so that the terminal can still receive the downlink signal from the source base station in the handover process. Therefore, downlink signal transmission interruption caused by the handover process may be reduced to 0 ms or nearly 0 ms. In other words, zero interruption or nearly zero interruption of data transmission may be implemented.

Abstract: This application provides an uplink signal sending method and a terminal. The terminal may determine a symbol that needs to be punctured, and send the uplink signal based on the symbol that needs to be punctured, so that conflicting use of the overlapping symbol is avoided. Further, the terminal may notify the source cell and/or the target cell of the symbol that needs to be punctured, so that the source cell or the target cell improves, according to a notification indication, decoding on the uplink signal sent by the terminal.

Abstract: Embodiments of the present invention relate to a channel estimation method, a base station, user equipment UE, and a system. The method includes: setting up, by a base station, a connection to user equipment UE; and sending, to the UE, notification information indicating that the UE is in a radio remote scenario, where the notification information is used to instruct the UE to perform channel estimation by using a channel estimation algorithm applicable to the radio remote scenario, and the channel estimation algorithm is used to perform channel estimation on a signal that is obtained after downlink signals from multiple radio remote units RRUs are superposed. The UE can perform channel estimation by using the appropriate channel estimation algorithm, to effectively improve accuracy of the channel estimation, thereby effectively improving a downlink data throughput of the UE.

Abstract: Embodiments of the present invention relate to the communications field and disclose a data transmission device, method, and system, so as to better improve an average downlink throughput of UE. A specific solution is: A determining unit determines a downlink frequency shift according to a received uplink signal sent by a terminal device, and determines a second transmit frequency according to the downlink frequency shift and a first transmit frequency; and a sending unit sends a downlink signal to the terminal device according to the second transmit frequency determined by the determining unit, so that the terminal device receives the downlink signal according to a receive frequency corresponding to the first transmit frequency, where the downlink signal includes at least one of a DMRS or downlink data. The present invention is applied in a data transmission process.

Abstract: Embodiments of the present invention relate to a channel estimation method, a base station, user equipment UE, and a system. The method includes: setting up, by a base station, a connection to user equipment UE; and sending, to the UE, notification information indicating that the UE is in a radio remote scenario, where the notification information is used to instruct the UE to perform channel estimation by using a channel estimation algorithm applicable to the radio remote scenario, and the channel estimation algorithm is used to perform channel estimation on a signal that is obtained after downlink signals from multiple radio remote units RRUs are superposed. The UE can perform channel estimation by using the appropriate channel estimation algorithm, to effectively improve accuracy of the channel estimation, thereby effectively improving a downlink data throughput of the UE.

Abstract: A channel estimation method, a base station, user equipment (UE), and a system are provided. The method includes: setting up, by a base station, a connection to user equipment UE; and sending, to the UE, notification information indicating that the UE is in a radio remote scenario, where the notification information is used to instruct the UE to perform channel estimation by using a channel estimation algorithm applicable to the radio remote scenario, and the channel estimation algorithm is used to perform channel estimation on a signal that is obtained after downlink signals from multiple radio remote units RRUs are superposed. The UE can perform channel estimation by using the appropriate channel estimation algorithm, to effectively improve accuracy of the channel estimation, thereby effectively improving a downlink data throughput of the UE.

Abstract: A method and device for estimating the time of arrival (ToA) of a radio signal are proposed. The radio signal comprises M subsignals carried on M subcarriers, where M is an integer ?2. The number of propagation paths and the time of arrival associated with a first path are estimated. The technique can improve ToA estimation accuracy, especially in a multipath fading channel, and reduce the need for channel information.